diff --git a/tools/testing/selftests/arm64/fp/vec-syscfg.c b/tools/testing/selftests/arm64/fp/vec-syscfg.c
index 272b888e018e4..c90658811a838 100644
--- a/tools/testing/selftests/arm64/fp/vec-syscfg.c
+++ b/tools/testing/selftests/arm64/fp/vec-syscfg.c
@@ -21,8 +21,6 @@
 #include "../../kselftest.h"
 #include "rdvl.h"
 
-#define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0]))
-
 #define ARCH_MIN_VL SVE_VL_MIN
 
 struct vec_data {